Arithmetic of character varieties of free groups
classification
🧮 math.AG
math.GRmath.RT
keywords
characterfinitefreegroupsvarietiesarithmeticcharacteristicscounting
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Via counting over finite fields, we derive explicit formulas for the E-polynomials and Euler characteristics of GL(d)- and PGL(d)-character varieties of free groups. We prove a positivity property for these polynomials and relate them to the number of subgroups of finite index.
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